Preparing method and use method of chlorinated organic compound polluted soil repairing agent

Abstract

The invention discloses a preparing method and a use method of a chlorinated organic compound polluted soil repairing agent. The preparing method comprises: adding bentonite particles into deionized water, agitating, centrifuging at a low speed and removing particles of which the particle size is larger than 2 micrometers; adding the bentonite particles into a 0.1M FeCl3 solution according to an adding amount of 20-50g / L, agitating, mixing, centrifuging to remove supernatant, obtaining Fe3+ saturated bentonite particles, and washing; putting iron ion saturated bentonite particles into de-oxidized and deionized water, regulating the pH of a solution to 2 to 3.5, rapidly adding NaBH4 into particle paste under inert gas protection, rapidly covering a bottle cap, reacting for 1-3 minutes at a room temperature, and centrifuging at a high speed so as to obtain supported type ultrafine zero-valent iron; and 4), mixing alcohol of which the purity is higher than 95% with the supported type ultrafine zero-valent iron according to a ratio of 20-40:1, preparing the repairing agent, sealing and storing. Chlorinated organic compound polluted soil is synchronously treated by using an organic cosolvent and the zero-valent iron. The method can improve the soil repairing efficiency under the condition of saving cost and lowering actual operation difficulty.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution control, and relates to a preparation method and a use method of a chlorinated organic polluted soil remediation agent. Background technique: [0002] Common chlorinated organic pollutants have tertiary effects and endocrine disrupting effects on the human body. They have been widely used in chemical and electrical products, and enter the natural environment in large quantities mainly through emissions, leakage, and volatilization [VanEmonJ.M., ChuangJ.C. Development and application of immunoaffinity chromatography for coplanar PCBs in soil and sediment. Chemosphere, 2013, 90(1): 1-6.]. Due to their low solubility and high stability, most chlorinated organic pollutants exist in soil and sediment, and may penetrate deeper, posing a threat to groundwater quality. Because of its refractory degradation and great harm, the remediation technology of chlorinated organic compounds polluted soil h...

AI Technical Summary

Problems solved by technology

[0004] However, since most chlorinated organic compounds have very low water solubility and thus are mainly adsorbed on the surface of soil particles, even when using nano-loaded zero-valent iron to treat chlorinated organic-contaminated soil, an important problem still exists: how to make zero-valent Active ingredients are efficiently exposed to adsorbed organic pollutants

However, this treatment method has some serious disadvantages, such as: longer treatment time, additional equipment, and material transfer from soil elution to liquid phase degradation treatment units, etc.